Comprehensive Description
(
Anglèis
)
fornì da North American Flora
Helenium ooclinium A. Gray, Proc. Am. Acad. 9: 202. 1874
Heleniastrum ooclinium Kuntze, Rev. Gen. 342. 1891.
A freely branching annual; stem 3-6 dm. high, glabrous, angled; leaves lanceolate, often narrowly so, the lower more or less dentate, the upper ones small; heads corymbose; peduncles 3-8 cm. long; bracts lance-subulate; ray-flowers pistillate; ligules yellow, 5-10 mm. long, 4-6 mm. wide; disk slightly longer than broad, fuscous or brownish-yellow, 8-10 mm. broad; corollas 2 mm. long; tube a mere ring; throat deeply campanulate; achenes fully 1 mm. long, hispid on the angles; squamellae ovate, obtuse, 0.6-0.8 mm. long.
Type locality: In the Nazas Valley, Bolson de Mapimi, "Chihuahua" [probably Coahuila], Distribution: Texas to San Luis Potosi and Durango.
- sitassion bibliogràfica
- Per Axel Rydberg. 1915. (CARDUALES); CARDUACEAE; HELENIEAE, TAGETEAE. North American flora. vol 34(2). New York Botanical Garden, New York, NY
